Live Chat I-90 Community Nearby Traffic I 495 exit 21b a 2024-04-25 Roadnow Weather | Gas | Restaurants | Hotels | Car Repair | Convenience Stores Cities close to I-495 Exit 21b A Ashland, MA 7.48 Milford, MA 8.00 Upton, MA 8.11 Interstate highway exits close to I-495 Exit 21b A Exit 21b a, i495ma 1.22 Exit 22, i495ma 5.71 Exit 11a, i90 5.72 Interstate highways close to I-495 Exit 21b A i495ma map 1.22 i90 map 5.72 i290ma map 15.91 State roads close to I-495 Exit 21b A MA 135 map 6.69 MA 140 map 7.50 MA 9 map 7.82